Mass Transfer Processes: Modeling, Computations, and Design

Chapter 5. Equations of Mass Transfer

Learning Objectives

After completing this chapter, you will be able to:

• Derive differential equations for mass transfer in Cartesian coordinates in flux form.

• Express these relationships in vector form so that they can be used for any coordinate system.

• Define the mixture velocity and the diffusion flux.

• Examine some properties of the diffusion flux.

• State some forms of Fick’s law for binary systems depending on the frame of reference used.

• Derive the differential equation for the concentration field by combining the equation in the flux form with Fick’s law.

• State the boundary conditions for many standard cases.

• Show how averaging of differential models leads to mesoscopic and macroscopic models, and describe ...